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[Bug 1849165] [NEW] _populate_assigned_resources raises "TypeError: argument of type 'NoneType' is not iterable" during active migration

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Public bug reported:

Seen here:

https://zuul.opendev.org/t/openstack/build/2b10b4a240b84245bcee3366db93951d/log/logs/screen-n-cpu.txt.gz?severity=4#2675

Oct 21 13:35:16.977968 ubuntu-bionic-rax-iad-0012404623 nova-
compute[26938]: ERROR nova.compute.manager [None req-dd5ddbad-4234-4288
-bbab-2c3d20b7f4ad None None] Error updating resources for node ubuntu-
bionic-rax-iad-0012404623.: TypeError: argument of type 'NoneType' is
not iterable

Oct 21 13:35:16.977968 ubuntu-bionic-rax-iad-0012404623 nova-
compute[26938]: ERROR nova.compute.manager Traceback (most recent call
last):

Oct 21 13:35:16.977968 ubuntu-bionic-rax-iad-0012404623 nova-
compute[26938]: ERROR nova.compute.manager   File
"/opt/stack/new/nova/nova/compute/manager.py", line 8925, in
_update_available_resource_for_node

Oct 21 13:35:16.977968 ubuntu-bionic-rax-iad-0012404623 nova-
compute[26938]: ERROR nova.compute.manager     startup=startup)

Oct 21 13:35:16.977968 ubuntu-bionic-rax-iad-0012404623 nova-
compute[26938]: ERROR nova.compute.manager   File
"/opt/stack/new/nova/nova/compute/resource_tracker.py", line 883, in
update_available_resource

Oct 21 13:35:16.977968 ubuntu-bionic-rax-iad-0012404623 nova-
compute[26938]: ERROR nova.compute.manager
self._update_available_resource(context, resources, startup=startup)

Oct 21 13:35:16.977968 ubuntu-bionic-rax-iad-0012404623 nova-
compute[26938]: ERROR nova.compute.manager   File
"/usr/local/lib/python2.7/dist-packages/oslo_concurrency/lockutils.py",
line 328, in inner

Oct 21 13:35:16.977968 ubuntu-bionic-rax-iad-0012404623 nova-
compute[26938]: ERROR nova.compute.manager     return f(*args, **kwargs)

Oct 21 13:35:16.977968 ubuntu-bionic-rax-iad-0012404623 nova-
compute[26938]: ERROR nova.compute.manager   File
"/opt/stack/new/nova/nova/compute/resource_tracker.py", line 965, in
_update_available_resource

Oct 21 13:35:16.977968 ubuntu-bionic-rax-iad-0012404623 nova-
compute[26938]: ERROR nova.compute.manager
self._populate_assigned_resources(context, instance_by_uuid)

Oct 21 13:35:16.977968 ubuntu-bionic-rax-iad-0012404623 nova-
compute[26938]: ERROR nova.compute.manager   File
"/opt/stack/new/nova/nova/compute/resource_tracker.py", line 482, in
_populate_assigned_resources

Oct 21 13:35:16.977968 ubuntu-bionic-rax-iad-0012404623 nova-
compute[26938]: ERROR nova.compute.manager     if mig.dest_compute ==
self.host and 'new_resources' in mig_ctx:

Oct 21 13:35:16.977968 ubuntu-bionic-rax-iad-0012404623 nova-
compute[26938]: ERROR nova.compute.manager TypeError: argument of type
'NoneType' is not iterable

Oct 21 13:35:16.977968 ubuntu-bionic-rax-iad-0012404623 nova-
compute[26938]: ERROR nova.compute.manager

This was added late in Train:

https://review.opendev.org/#/c/678452/

** Affects: nova
     Importance: High
         Status: Confirmed

** Affects: nova/train
     Importance: High
         Status: Confirmed


** Tags: resource-tracker

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https://bugs.launchpad.net/bugs/1849165

Title:
  _populate_assigned_resources raises "TypeError: argument of type
  'NoneType' is not iterable" during active migration

Status in OpenStack Compute (nova):
  Confirmed
Status in OpenStack Compute (nova) train series:
  Confirmed

Bug description:
  Seen here:

  https://zuul.opendev.org/t/openstack/build/2b10b4a240b84245bcee3366db93951d/log/logs/screen-n-cpu.txt.gz?severity=4#2675

  Oct 21 13:35:16.977968 ubuntu-bionic-rax-iad-0012404623 nova-
  compute[26938]: ERROR nova.compute.manager [None req-
  dd5ddbad-4234-4288-bbab-2c3d20b7f4ad None None] Error updating
  resources for node ubuntu-bionic-rax-iad-0012404623.: TypeError:
  argument of type 'NoneType' is not iterable

  Oct 21 13:35:16.977968 ubuntu-bionic-rax-iad-0012404623 nova-
  compute[26938]: ERROR nova.compute.manager Traceback (most recent call
  last):

  Oct 21 13:35:16.977968 ubuntu-bionic-rax-iad-0012404623 nova-
  compute[26938]: ERROR nova.compute.manager   File
  "/opt/stack/new/nova/nova/compute/manager.py", line 8925, in
  _update_available_resource_for_node

  Oct 21 13:35:16.977968 ubuntu-bionic-rax-iad-0012404623 nova-
  compute[26938]: ERROR nova.compute.manager     startup=startup)

  Oct 21 13:35:16.977968 ubuntu-bionic-rax-iad-0012404623 nova-
  compute[26938]: ERROR nova.compute.manager   File
  "/opt/stack/new/nova/nova/compute/resource_tracker.py", line 883, in
  update_available_resource

  Oct 21 13:35:16.977968 ubuntu-bionic-rax-iad-0012404623 nova-
  compute[26938]: ERROR nova.compute.manager
  self._update_available_resource(context, resources, startup=startup)

  Oct 21 13:35:16.977968 ubuntu-bionic-rax-iad-0012404623 nova-
  compute[26938]: ERROR nova.compute.manager   File
  "/usr/local/lib/python2.7/dist-
  packages/oslo_concurrency/lockutils.py", line 328, in inner

  Oct 21 13:35:16.977968 ubuntu-bionic-rax-iad-0012404623 nova-
  compute[26938]: ERROR nova.compute.manager     return f(*args,
  **kwargs)

  Oct 21 13:35:16.977968 ubuntu-bionic-rax-iad-0012404623 nova-
  compute[26938]: ERROR nova.compute.manager   File
  "/opt/stack/new/nova/nova/compute/resource_tracker.py", line 965, in
  _update_available_resource

  Oct 21 13:35:16.977968 ubuntu-bionic-rax-iad-0012404623 nova-
  compute[26938]: ERROR nova.compute.manager
  self._populate_assigned_resources(context, instance_by_uuid)

  Oct 21 13:35:16.977968 ubuntu-bionic-rax-iad-0012404623 nova-
  compute[26938]: ERROR nova.compute.manager   File
  "/opt/stack/new/nova/nova/compute/resource_tracker.py", line 482, in
  _populate_assigned_resources

  Oct 21 13:35:16.977968 ubuntu-bionic-rax-iad-0012404623 nova-
  compute[26938]: ERROR nova.compute.manager     if mig.dest_compute ==
  self.host and 'new_resources' in mig_ctx:

  Oct 21 13:35:16.977968 ubuntu-bionic-rax-iad-0012404623 nova-
  compute[26938]: ERROR nova.compute.manager TypeError: argument of type
  'NoneType' is not iterable

  Oct 21 13:35:16.977968 ubuntu-bionic-rax-iad-0012404623 nova-
  compute[26938]: ERROR nova.compute.manager

  This was added late in Train:

  https://review.opendev.org/#/c/678452/

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Follow ups

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